Boiler-circulator.



c. STEWART.

BOILEB OIRGULATOR.

APPLICATION FILED JUNE 21. 1910.

2 SHEETS-SHEET 1 C. STEWART.

BOILER OIRGULATOB.

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i ff I Patented May 30, 1911.

2 BREWER-SHEET 2.

CHARLES STEWART, OF BROOKLYN, NEW YORK.

BOILER-CIRCULATOR.

Specication of Letters Patent.

Patented May 30, 1911.

Application led June 21, 1910. Serial No. 568,185.

as will enable others skilled in the art to which it appertains to makeand use the same.

My invention relates to means for reducing the circulation of water inboilers, particularly those of the Scotch type where the water lies in aconsiderable mass around the furnace and fire tubes.

The invention resides in certain special features of construction andorganization of parts which will be fully set forth hereinafter andparticularly pointed out in the claims.

Reference is now had to the accompaying drawings which represent, as anexample, the preferred embodiment of my invention and, in which drawingsFigure 1 is a longitudinal section of a boiler of the Scotch typeshowing my invention applied; Fig. 2 is an enlarged vertical section ofthe circulator proper; Fig. 3 is a side elevation thereof showing theboiler stays in sections; Fig. 4 is a plan view of the invention,showing its relation to the stays; and Fig. 5 is an elevation of theconical collector and tube.

In Fig. 1, 10 indicates the boiler shell, 11 the furnace, 12 the backconnection, 14 the fire or return tubes, 15 the up-take, and 16 thestays, all of which is illustrated as of the coventional construction.Such boilers are provided with manholes in various situations accordingto the make of the boiler and to the conditions of its insulations. Ofthese manholes one is indicated at 17 in the drawings. One of thediflicult problems encountered by my invention is the provision of aconstruction y y which, notwithstanding the variations and uncertaintiesconcerning the manholes, will allow the circulator to be introducedconveniently and properly and securely mounted. In operation the waterlies in the boiler around the furnace and tubes at approximately thelevel indicated by the broken line in Fig. 1.

My improved boiler circulator comprises a vertically disposed chamber19, closed at its bottom by an upwardly tapering collector 20. Thiscollector is open at its ends and mounts a tube 21 which standsvertically and centrally in the chamber 19 and has one or more verticalslots 22 extending throughout its length. From the lower part of thechamber 19 a tube 23 passes downward to the bottom of the boiler and ispreferably provided with a horizontally disposed branch 24Y havingnumerous perforations for the outlet of the water. The chamber 19 andcollector 20 are placed in the hottest portion of the boiler, namely,over the tubes 14 in such a manner that the lower end of the collectoris submerged in the upper portion of the body of water in the boiler.

25 indicates a small pipe passing from the exterior of the boiler andcommunicating with a source of steam independent of the particularboiler to which the circulator is ap lied. This tube 25 passes throughthe col ector 20 and terminates in a flaring upwardly disposed nozzle 26located in the axial center of the tube 21.

In operation, when fire is started in the boiler and the Water is cold,live steam is admitted through the tube 25. This steam escaping by thenozzle 26 produces an injector-like action in the throat of thecollector 20 and water in the top of the boiler which is novsr becomingwarm is raised through the pipe 21 and accumulates in the chamber 19above the water level. As the water thus accumulates, it flows bygravity through the tube 23, circulating to the bottom of the boiler.This keeps the temperature of the water uniform during the warming upperiods. The steam escaping from the nozzle 26 passes up out of the topof the tube 21, while the water flows through the slots 22 in said tubeat various elevations. The tube 25 is, of course, provided with asuitable valve (not shown) to control the steam flow. In the practicalinstallation of my invention, for example, on shipboard, to which it isespecially applicable, the tube 25 will be connected with thedonkey-boiler in which steam is almost invariably maintained constantly.When steam is raised in the main boiler, to which the circulator isapplied, the pipe 25 is closed and the operation of the circulatorbecomes normal. This normal operation consists in the ebullition of thewater near the surface thereof, which causes the steam to rise in theconical collector 20 and by reason of the form thereof an upwardcirculation of steam and waterl takes place in the constricted throat ofthe collector. This rises in the tube 21 as before described, the steampassing up through and out of the tube 21 and the water flowing outthrough the slots therein at various points according to the level ofwater maintained in the chamber. This water accumulating in the chamber19 flows down through the pipe 23 and escapes at the bottom. By reasonof the invention therefore the hottest water at the top of the boiler iscollected by operations going on in the boiler itself and fiows down tothe bottom where the water is coolest. It then rises by naturalcirculation and in this manner the temperature in the boiler is keptuniform throughout.

In addition to the novel features concerning the collector'and slottedtube andthe exciting pipe 25, my invention involves important featuresof construction, which allow me to adapt it to numerous varyingsituations and to place it easily and securely in position. According tothis, the collector 20 is cast in two sections divided along itsvertical center and the tube 21 is cast integral with these sections,the slots 22- in such tube being formed by spaces between the verticaledges of the sections of the tube. The sections of the collector arefastened together by bolts 20a extending through ears on the sectionsand the collector is formed with an annular seat 20b for the chamber. Inthis connection it is pointed out that while I prefer to slot the tube21 the same effect may be produced by a series of orices at dierentpoints the length of the tube and I consider this together with variousother obvious modifications as well within the purview of my invention.

The chamber 19 is constructed in a number of horizontal sections,preferably of castV metal, and engaged one with the Vother by flanges19a shown in Figs. 2 and 3. The lowermost section is rested on the seat2Ob and all of the sections'are held in engagement and fastened on thecollector by tie-` rods 27 passing through a bar 28 at the top andscrewingvinto the seat 2()b of the collector. The lowermost section ofthe chamber is formed with a case and opening 19b to accommodate thepipe 23.

The circulator is mounted and held in the boiler through the medium ofthe stay-rods 16 which are to be found in all boilers of` the type towhich my invention is applicable. To admit of this the sections of thechamber 19, or at least the upper sections, are cast with plane faces19c having numerous tap ped holes 19d. These faces are adapted to beengaged by supporting bars 29 provided with bolts 30 which are engagedwith such of the openings 19dy as may be convenient under thecircumstances of each particular installation. Of these supporting bars29, two are provided for each boiler circulator and they extendhorizontally between the two adjacent stay rods 16 bearing thereon. Theends of the bars are vertically slotted as indicated at 29a toaccommodate U-bolts 31 which clamp the bars to the stay rods. This, itwill be seen, rigidly mounts the circulator in position and by reason ofthe sectional formation and the other peculiar features pointed out I amallowed to introduce the circulator into a boiler of any arrangement,assembling the parts within the boiler and finally clamping themthoroughly in place.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent of the United States, is:

1. A boiler circulator having an upwardly tapered collector adapted tostand with its open lower end submerged but near the surface of thewater, a chamber above the collector, the chamber extending above thewater level in the boiler, a tube communicating with the open upper endof the collector and extending vertically in the chamber, said tubehaving a vertically disposed water outlet along its length and havingits upper end open for the escape of steam, and a connection extendingabove the water line downward to the lower part of the boiler.

2. A boiler circulator having an upwardly tapered collector adapted tostand with its open lower end submerged but near the surface of thewater, a chamber above the collector, the chamber extending above thewater level in the boiler, a tube communicating with the o en upper `endof the collector and exten ing vertically in the chamber, said tubehaving a vertically disposed water outlet and having its upper end openfor the escape of steam, a connection extending from the chamber abovethe water line downward to the lower part of the boiler, and an excitingtube passing from without the boiler into and discharging at the throatof the collector.

3. A boiler circulator having a chamber extending above the water level,a connection extending from the chamber above the water level downwardto the lower part of the boiler, means for raising water in the chamberby the ebullition of the water in the boiler and an exciting tubepassing from without the boiler and discharging into said means forraising the water.

4. A boiler circulator comprising a chamber, means attached thereto andengaging the stay rods of the boiler to mount the chamber with a part atleast above the waterv level, a connection from the chamber above thewater level to the lower part of the boiler and means for raising waterin the chamber by the ebullition of the boiler.

5. A boiler circulator having a chamber.

formed of horizontal superimposed sections, a collector at the bottom onwhich said sections are mounted, means for tightening the sections onthe collector, a connection from the chamber above the water line to thelower part of the boiler and means for mounting the circulator intoposition.

6. A boiler circulator comprising a chamber, means for raising waterwithin, a connection from 'the chamber above the water line to the lowerpart of the boiler, supporting bars, and means for adjustably fasten#ing them to the sides of the chamber, said bars extending horizontallyinto engagement with the stay rods of the boiler.

7 A boiler eirculator comprising a chamber, means for raising waterwithin, a conneetion from the chamber above the Water line to the lowerpart of the boiler, supporting bars, means for adjustably fastening themto the sides of the chamber, said bars extending horizontally intoengagement with with the stay rods of the boiler, and means forfastening said supporting bars to the stay rods.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing Witnesses.

CHARLES STEWART. Witnesses:

F. C. MARTIN, B. Breen.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents, Washington, D. C.

